Acoustics - Reference zero for the calibration of audiometric equipment - Part 1 : reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones.

声学。测听设备校准用参照区。第1部分：纯音和耳挂式耳机的参考等效阈声压级。

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In this paper, errors of digital levels are introduced. Calibration methods of the collimation error and the system accuracy are presented.

分析了数字水准仪系统的误差源，阐述了仪器i角误差和综合精度的检定方法。

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With zero grams of activation force, Crescendo Sensor works at all angles and requires absolutely no calibration, providing hundreds of levels of pressure.

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Additionally, ISFccc calibration options allows for professional calibration to set "day" and "night" levels for optimal viewing and brightness levels customized to the consumers own viewing environment.

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